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Table 5 Number of teeth affected by severe EARR according to tooth group (grade-IV RR according to Malmgren) (tooth level)

From: Root resorption, treatment time and extraction rate during orthodontic treatment with self-ligating and conventional brackets

  Teeth affected by sEARR (n = 6) Teeth non-affected by sEARR (n = 1698) Total (N = 1704)
Tooth group n (%) n (%) n (%)
  12,22 1 (0.2) 425 (99.8) 426 (100.0)
  11,21 1 (0.2) 425 (99.8) 426 (100.0)
  32,42 0 (0.0) 426 (100.0) 426 (100.0)
  31,41 4 (0.9) 422 (99.1) 426 (100.0)
  1. EARR: external apical root resorption, sEARR: severe external apical root resorption.